I understand the steps to to an in place upgrade to AEM 6.4, but I am a bit confused when it comes to upgrade to the service pack. Below are the steps as per my understanding:
1. Do an in-place upgrade from 6.3 to 6.4 by following the steps https://helpx.adobe.com/experience-manager/6-4/sites/deploying/using/in-place-upgrade.html
2. After it is successfully done, start the 6.4 instance and then install the service pack 3 through package manager
3. Restart the instance and do a sanity.
Are the above steps correct or do I need to make other changes?
After you do the inplace-upgrade. Install the 6.4.3 service pack through the Package Manager.
There shouldn't be a need to restart AEM, OSGI will handle all the package refreshes that need to happen.